CN104578032B - Overvoltage protection device - Google Patents
Overvoltage protection device Download PDFInfo
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- CN104578032B CN104578032B CN201410811873.0A CN201410811873A CN104578032B CN 104578032 B CN104578032 B CN 104578032B CN 201410811873 A CN201410811873 A CN 201410811873A CN 104578032 B CN104578032 B CN 104578032B
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Abstract
The invention discloses a kind of overvoltage protection device.Wherein, the protector includes：Second end of the first end connection of semiconductor switch circuit, first end and protected device, the second end and protected device is connected, the opening and closing for control overvoltage protection device；Triggers circuit, is connected with the control end of semiconductor switch circuit, for triggering semiconductor switch circuit.By the present invention, the problem of clamp voltage that overvoltage protection device of the prior art provided is too high to providing effective protection by protection equipment or circuit is solved, protection effective to protected device and safe is realized.
Description
Technical field
The present invention relates to power domain, in particular to a kind of overvoltage protection device.
Background technology
Now, the overvoltage protection device based on pressure sensitive technology is widely used in electrical design, behind its protection
Equipment or circuit.But there is problems with existing technology：The minimum clamp voltage that overvoltage protection device can be provided be by
2 times of protection equipment operating voltage, and lower clamp voltage is generally required by protection equipment, the 1.5 of such as its operating voltage
Times or 1.3 times, or even have by protection equipment require overvoltage protection device provide clamp voltage be not higher than its operating voltage,
This, which has resulted in overvoltage protection device, can not effectively protect the defencive function of rear class equipment or circuit, i.e. overvoltage protection device
Do not start also and rear class is damaged by protection equipment due to overtension；Overvoltage protection device leakage current is excessive,
Meeting absorbed power causes self-heating, so as to accelerate aging, so that multiple surge impact can not be born；Overvoltage protection device
It can not disconnect automatically in the event of a failure, easy short circuit causes fire.
The clamp voltage provided for overvoltage protection device of the prior art be too high to by protection equipment or
The problem of circuit provides effective protection, not yet proposes effective solution at present.
The content of the invention
The clamp voltage provided for overvoltage protection device of the prior art be too high to by protection equipment or
The problem of circuit provides effective protection, not yet proposes effective solution, therefore, it is a primary object of the present invention to carry at present
For a kind of overvoltage protection device, to solve the above problems.
To achieve these goals, according to an aspect of the invention, there is provided a kind of overvoltage protection device, this method bag
Include：Second end of the first end connection of semiconductor switch circuit, first end and protected device, the second end and protected device connects
Connect, the opening and closing for controlling overvoltage protection device；Triggers circuit, is connected with the control end of semiconductor switch circuit, for triggering
Semiconductor switch circuit.
Further, semiconductor switch circuit includes：First IGCT and the second IGCT, wherein, the first IGCT
Negative pole is connected with the positive pole of the second IGCT, and the positive pole of the first IGCT is connected with the negative pole of the second IGCT, the first IGCT
Gate pole and the second IGCT gate pole as semiconductor switch circuit control end；Triggers circuit includes：First TVS pipe, the
One end is connected with the gate pole of the first IGCT；First resistor, first end is connected with the second end of the first TVS pipe, the second end and the
The gate pole connection of two IGCTs.
Further, semiconductor switch circuit includes：Bidirectional thyristor, wherein, the first end of bidirectional thyristor is used as half
The first end of conductor on-off circuit, the second end of bidirectional thyristor is used as the second end of semiconductor switch circuit, bidirectional thyristor
Control end as semiconductor switch circuit control end；Triggers circuit includes：Solid discharge device, first end and two-way brilliant lock
The control end of the first end connection of pipe, the second end and bidirectional thyristor is connected.
Further, overvoltage protection device also includes：Voltage clamping circuit, the second end of semiconductor switch circuit is by clamping piezoelectricity
Road and the second end of protected device are connected, and voltage clamping circuit is used to absorb the surge current in overvoltage protection device.
Further, voltage clamping circuit includes：The second end connection of second TVS pipe, first end and semiconductor switch circuit, the
Two ends and the second end of protected device are connected.
Further, voltage clamping circuit includes：The second end connection of piezo-resistance, first end and semiconductor switch circuit, the
Two ends and the second end of protected device are connected.
Further, overvoltage protection device includes：Fuse, voltage clamping circuit pass through fuse and protected device second
End connection.
Further, overvoltage protection device also includes：The first end of second resistance, first end and semiconductor switch circuit connects
Connect, the second end connection of the second end and voltage clamping circuit.
Further, overvoltage protection device also includes：Light emitting diode, light emitting diode constitutes series electrical with second resistance
Road, second resistance is connected by the second end of light emitting diode and voltage clamping circuit, or the first end of semiconductor switch circuit passes through
Light emitting diode is connected with second resistance.
Further, overvoltage protection device also includes：First diode, series circuit passes through the first diode and pincers piezoelectricity
The second end connection on road.
Using the present invention, it is combined using semiconductor switch circuit and triggers circuit and is used as overvoltage protection device.Wherein, exist
Leakage current can be greatly decreased in the semiconductor switch device used in semiconductor switch circuit, while semiconductor switch device is certainly
Body can be to provide clamp voltage, for protecting by protection equipment or circuit by protection equipment or circuit；Triggers circuit is used to touch
Semiconductor switch circuit is sent out, the trigger voltage that triggers circuit is provided can adjust according to the actual requirements, while triggers circuit is produced
Raw electric current is smaller, it is to avoid infringement to semiconductor switch circuit.By the present invention, overvoltage of the prior art is solved
The problem of clamp voltage that protector is provided is too high to providing effective protection by protection equipment or circuit, realizes pair
The effective and safe protection of protected device.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of the optional overvoltage protection device of according to embodiments of the present invention one；
Fig. 2 is the schematic diagram of another optional overvoltage protection device according to embodiments of the present invention；
Fig. 3 is the schematic diagram of the optional overvoltage protection device of according to embodiments of the present invention the 3rd；
Fig. 4 is the schematic diagram of the optional overvoltage protection device of according to embodiments of the present invention the 4th；
Fig. 5 is the schematic diagram of the optional overvoltage protection device of according to embodiments of the present invention the 5th；And
Fig. 6 is the schematic diagram of the optional overvoltage protection device of according to embodiments of the present invention the 6th.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model that the present invention is protected
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Lid is non-exclusive to be included, for example, the process, method, system, product or the equipment that contain series of steps or unit are not necessarily limited to
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
Fig. 1 is the schematic diagram of the optional overvoltage protection device of according to embodiments of the present invention one, and this is excessively electric as shown in Figure 1
Pressure protector can include：Semiconductor switch circuit 20 and triggers circuit 40.
Wherein, the first end of semiconductor switch circuit 20 and the first end of protected device are connected, and the second end is with being protected
The second end connection of device, the opening and closing for controlling overvoltage protection device；Triggers circuit 40 and the control of semiconductor switch circuit
End connection, for triggering semiconductor switch circuit.
Using the present invention, it is combined using semiconductor switch circuit and triggers circuit and is used as overvoltage protection device.Wherein, exist
Leakage current can be greatly decreased using semiconductor switch device in semiconductor switch circuit, while semiconductor switch device itself energy
Enough to provide clamp voltage by protection equipment or circuit, for protecting by protection equipment or circuit；Triggers circuit is used to trigger half
Conductor on-off circuit, the trigger voltage that triggers circuit is provided can adjust according to the actual requirements, while what triggers circuit was produced
Electric current is smaller, it is to avoid infringement to semiconductor switch circuit.By the present invention, overvoltage protection of the prior art is solved
The problem of clamp voltage that device is provided is too high to providing effective protection by protection equipment or circuit, realizes to being protected
Protect the effective and safe protection of device.
In the above-described embodiments, semiconductor switch circuit can include the brilliant locks of the first IGCT D1 and second shown in Fig. 2
Pipe D2, wherein, the negative pole of the first IGCT is connected with the positive pole of the second IGCT, the positive pole of the first IGCT and the second IGCT
Negative pole connection, the gate pole of the gate pole of the first IGCT and the second IGCT as semiconductor switch circuit control end；Triggering
Circuit can include：First TVS pipe (TVS1 i.e. in figure), first end is connected with the gate pole of the first IGCT；First resistor R1,
First end is connected with the second end of the first TVS pipe, and the second end is connected with the gate pole of the second IGCT.
Fig. 2 is the schematic diagram of another optional overvoltage protection device according to embodiments of the present invention, detailed with reference to Fig. 2
State embodiments of the invention.
As shown in Fig. 2 semiconductor switch circuit can include the first IGCT D1 and the second IGCT D2, triggers circuit can
With including the first TVS pipe TVS1 (Transient Voltage Suppressor, i.e. Transient Suppression Diode) and first resistor
(i.e. current-limiting resistance) R1.L and N is used to connect by protection circuit or equipment, if it is negative pole that L, which is positive pole, N, by protection equipment
Or during circuit normal work, then the first IGCT D1 of overvoltage protection device is in reverse blocking state；Triggers circuit does not have yet
There is electric current to pass through；Second IGCT D2 has the voltage of forward direction, but voltage is smaller, and the second IGCT D2 gate poles do not trigger electricity
Pressure, so the second IGCT D2 is off-state.If LN is suddenly struck by lightning at two ends, the first IGCT D1 is still in instead
To blocking state, and triggers circuit can then produce a trigger voltage, and this trigger voltage can be added in the second IGCT D2 door
Pole turns on the second IGCT D2, so as to start overvoltage protection device to by the protection of protection equipment or circuit.
In the above-described embodiments, can be according to actual needs by selecting different types of TVS pipe to adjust triggers circuit
Trigger voltage, such as AK10-240C.
In this embodiment, switch is used as using semiconductor devices so that leakage current is substantially reduced, while using semiconductor
Device causes clamp voltage to also reduce.
In the above embodiment of the present invention, voltage protector can also include：Voltage clamping circuit, semiconductor switch circuit
Second end is connected by the second end of voltage clamping circuit and protected device, and voltage clamping circuit is used to absorb the wave in overvoltage protection device
Gush electric current.
In above-described embodiment, voltage clamping circuit can also include：The second of piezo-resistance, first end and semiconductor switch circuit
Second end of end connection, the second end and protected device is connected.
Further, overvoltage protection device can also include：The first of second resistance, first end and semiconductor switch circuit
Second end of end connection, the second end and voltage clamping circuit is connected.
Further, overvoltage protection device can include：Fuse, voltage clamping circuit passes through fuse and protected device
Second end is connected.
Fig. 3 is the schematic diagram of the optional overvoltage protection device of according to embodiments of the present invention the 3rd, detailed with reference to Fig. 3
State embodiments of the invention.
As shown in figure 3, semiconductor switch circuit can include the first IGCT D1 and the second IGCT D2, triggers circuit can
To be used to connect by protection circuit or equipment, compared with Fig. 2, Fig. 3 including the first TVS pipe TVS1 and first resistor R1, L and N
Second resistance (such as high pressure turbine by resistance) R2 and fuse FU is added, the function of voltage clamping circuit uses pressure-sensitive in this embodiment
Resistance RZ is realized.Wherein, voltages of the second resistance R2 for safety resistance in institute's protective loop of releasing, it is ensured that the safety of circuit
Operation；Piezo-resistance RZ then plays a part of divided current, be specifically when high pressure arrives by by self-resistance reduction so that
Realize the effect of shunting；Fuse FU is used for lightning protection, and in overvoltage protection device normal work, fuse will not fuse, if
When overvoltage protection device meets with thunderbolt or failed, fuse FU can then melt because of the high temperature of the excessive generation of moment surge current
It is disconnected, so that it is guaranteed that overvoltage protection device is unlikely to be damaged.
In the above embodiment of the present invention, overvoltage protection device can also include：Light emitting diode, light emitting diode and
Two resistance constitute series circuit, and second resistance is connected by the second end of light emitting diode and voltage clamping circuit, or semiconductor switch
The first end of circuit is connected by light emitting diode with second resistance.
Fig. 4 is the schematic diagram of the optional overvoltage protection device of according to embodiments of the present invention the 4th, detailed with reference to Fig. 4
State embodiments of the invention.As shown in Figure 4：Semiconductor switch circuit can include the first IGCT D1 and the second IGCT D2,
Triggers circuit, which can include the first TVS pipe TVS1 and first resistor R1, L and N, to be used to connect by protection circuit or equipment, second
Resistance (such as high pressure turbine by resistance) R2 and fuse FU is used to provide circuit protective effect, and piezo-resistance RZ is used to provide one
Divide clamp voltage, overvoltage protection device can also include LED, and the LED be used for indicative function, facilitate user to look into
See the working condition residing for overvoltage protection device.
It should be further stated that, above-mentioned LED, which can be replaced into other, has the device of indicative function, such as optical coupling
Device, so as to form a long-range control point, advantageously the state in overvoltage protection device is checked and managed.
According to above-described embodiment, semiconductor switch circuit can also include：Bidirectional thyristor, wherein, bidirectional thyristor
First end is as the first end of semiconductor switch circuit, and the second end of bidirectional thyristor is used as the second of semiconductor switch circuit
End, the control end of bidirectional thyristor as semiconductor switch circuit control end；Triggers circuit can include：Solid discharge device
The control end of the first end connection of part, first end and bidirectional thyristor, the second end and bidirectional thyristor is connected.
Overvoltage protection device can also include：First diode, series circuit passes through the first diode and voltage clamping circuit
Second end is connected.
Fig. 5 is the schematic diagram of the optional overvoltage protection device of according to embodiments of the present invention the 5th, detailed with reference to Fig. 5
State embodiments of the invention.
As shown in figure 5, core circuit can include semiconductor switch circuit and triggers circuit.Wherein, semiconductor switch electricity
Road can include bidirectional thyristor D1, triggers circuit can include the first solid discharging tube S1 and the second solid discharging tube S2, L and
N is used to connect by protection circuit or equipment.Above-mentioned triggers circuit operation principle is similar with triggers circuit operation principle in Fig. 1,
I.e. when the voltage at L and N two ends exceedes predetermined value, the trigger voltage conducting semiconductor on-off circuit that triggers circuit is produced is that is, double
To IGCT D1；Fig. 5 adds the first diode D3 relative to above-mentioned several embodiments, for protecting LED, prevents backward voltage
Infringement；Device light emission diodes LED, second resistance R2 and fuse FU function in Figure 5 is identical with Fig. 4, Fig. 5
Middle TVS pipe is used to provide a part of clamp voltage.
It should be further stated that, in the above-described embodiments, triggers circuit can include two solid discharging tubes.It is former
Because often being worked under high pressure in overvoltage protection device, solid discharging tube is easily breakdown.According to two solid discharging tube strings
The form of connection, on the one hand can increase breakdown voltage prevents solid discharging tube from damaging；On the other hand, even if one of solid is put
Fulgurite is breakdown, and whole triggers circuit remains able to normal work.
In the above-described embodiments, voltage clamping circuit can also include：Second TVS pipe (TVS2 i.e. shown in Fig. 6), first end
It is connected with the second end of semiconductor switch circuit, the second end connection of the second end and protected device.
Fig. 6 is the schematic diagram of the optional overvoltage protection device of according to embodiments of the present invention the 6th, detailed with reference to Fig. 6
State embodiments of the invention.
As shown in fig. 6, semiconductor switch circuit can include the first IGCT D1 and the second IGCT D2, triggers circuit can
To be used to connect by protection circuit or equipment including the first TVS pipe TVS1 and first resistor R1, L and N, protection circuit can be wrapped
Second resistance R2 and fuse FU are included, its function device corresponding with above-described embodiment is identical.It is different from preceding embodiment
To employ the second TVS pipe in the present embodiment in voltage clamping circuit, i.e., high-power Transient Suppression Diode TVS2, its effect is
The impact of larger surge current can be born repeatedly, for absorbing the surge current under high voltage.
Specifically, when LN two ends are attacked by outside induced lightening or the voltage transient of other forms, triggers circuit is then
Voltage generation is had, when the voltage reaches that the second IGCT D2 trigger gate is prescribed a time limit, the second IGCT D2 becomes conducting state, wave
Gush voltage to be fully loaded on the second IGCT D2, at this moment the second TVS pipe TVS2 starts at once, converts voltages into current drain
To ground, and a large amount of electric energy for being struck by lightning and producing are absorbed in the form of body self-heating cooking.During overvoltage protection device works, if
Surge current has exceeded predetermined value during overvoltage protection device design, then fuse FU will fuse, to ensure whole circuit
It is safe and complete, while avoiding producing fire.If needing to detect overvoltage afterwards by being struck by lightning by protection circuit or equipment
Whether protector is intact, it is only necessary to judged by detecting the resistance value at LN two ends, and the resistance value at LN two ends is under normal circumstances
Second resistance R2 value, illustrates that fuse FU has blown, it is only necessary to change a guarantor if the resistance value at LN two ends is infinity
Dangerous silk FU, overvoltage protection device then can be with normal work.
Wherein, the clamped voltage value of overvoltage protection device is total to by the magnitude of voltage at the second IGCT D2 and the second TVS pipe two ends
With determining, the device model met can be selected to adjust clamp voltage according to actual needs.
As can be seen from the above description, the present invention realizes following technique effect：
Using the present invention, it is combined using semiconductor switch circuit and triggers circuit and is used as overvoltage protection device.Wherein, exist
Leakage current can be greatly decreased in the semiconductor switch device used in semiconductor switch circuit, while semiconductor switch device is certainly
Body can be to provide clamp voltage, for protecting by protection equipment or circuit by protection equipment or circuit；Triggers circuit is used to touch
Semiconductor switch circuit is sent out, the trigger voltage that triggers circuit is provided can adjust according to the actual requirements, while triggers circuit is produced
Raw electric current is smaller, it is to avoid infringement to semiconductor switch circuit.By the present invention, overvoltage of the prior art is solved
The problem of clamp voltage that protector is provided is too high to providing effective protection by protection equipment or circuit, realizes pair
The effective and safe protection of protected device.
The claimed semiconductor switch circuit of the present invention and each component of triggers circuit are all a kind of with determination shape
Shape, the entity products for constructing and occupying certain space.Such as all be with door, NOT gate electronic device can with independent operating, have
The electronic component of particular hardware structure.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (8)
1. a kind of overvoltage protection device, it is characterised in that including：
The first end connection of semiconductor switch circuit, first end and protected device, the of the second end and the protected device
Two ends are connected, the opening and closing for controlling overvoltage protection device；
Triggers circuit, is connected with the control end of the semiconductor switch circuit, for triggering the semiconductor switch circuit,
Wherein, the semiconductor switch circuit includes：First IGCT and the second IGCT, wherein, first IGCT
Negative pole is connected with the positive pole of second IGCT, and the negative pole of the positive pole of first IGCT and second IGCT connects
Connect, the gate pole of the gate pole of first IGCT and second IGCT as the semiconductor switch circuit the control
End,
Wherein, the triggers circuit includes：First TVS pipe, first end is connected with the gate pole of first IGCT；First electricity
Resistance, first end is connected with the second end of first TVS pipe, and the second end is connected with the gate pole of second IGCT.
2. overvoltage protection device according to claim 1, it is characterised in that the overvoltage protection device also includes：
Voltage clamping circuit, the second end of the semiconductor switch circuit passes through the voltage clamping circuit and the second of the protected device
End connection, the voltage clamping circuit is used to absorb the surge current in the overvoltage protection device.
3. overvoltage protection device according to claim 2, it is characterised in that the voltage clamping circuit includes：
Second TVS pipe, first end is connected with the second end of the semiconductor switch circuit, the second end and the protected device
Second end is connected.
4. overvoltage protection device according to claim 2, it is characterised in that the voltage clamping circuit includes：
Piezo-resistance, first end is connected with the second end of the semiconductor switch circuit, the second end and the protected device
Second end is connected.
5. overvoltage protection device as claimed in any of claims 2 to 4, it is characterised in that the overvoltage protection
Device includes：
Fuse, the voltage clamping circuit is connected by the fuse with the second end of the protected device.
6. overvoltage protection device as claimed in any of claims 2 to 4, it is characterised in that the overvoltage protection
Device also includes：
Second resistance, first end is connected with the first end of the semiconductor switch circuit, and the of the second end and the voltage clamping circuit
Two ends are connected.
7. overvoltage protection device according to claim 6, it is characterised in that the overvoltage protection device also includes：
Light emitting diode, the light emitting diode constitutes series circuit with the second resistance, and the second resistance passes through described
Light emitting diode is connected with the second end of the voltage clamping circuit, or the first end of the semiconductor switch circuit passes through described light
Diode is connected with the second resistance.
8. overvoltage protection device according to claim 7, it is characterised in that the overvoltage protection device also includes：
First diode, the series circuit is connected by first diode with the second end of the voltage clamping circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410811873.0A CN104578032B (en) | 2014-12-22 | 2014-12-22 | Overvoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410811873.0A CN104578032B (en) | 2014-12-22 | 2014-12-22 | Overvoltage protection device |
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| Publication Number | Publication Date |
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| CN104578032A CN104578032A (en) | 2015-04-29 |
| CN104578032B true CN104578032B (en) | 2017-10-31 |
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| CN201410811873.0A Active CN104578032B (en) | 2014-12-22 | 2014-12-22 | Overvoltage protection device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779601A (en) * | 2015-05-06 | 2015-07-15 | 杜尧生 | Overvoltage protection device and method |
| DE102016001742A1 (en) * | 2015-08-06 | 2017-02-09 | DEHN + SÖHNE GmbH + Co. KG. | Circuit arrangement for protecting a unit to be operated from a supply network against overvoltages |
| CN108879641A (en) * | 2018-08-16 | 2018-11-23 | 安徽新在线科技股份有限公司 | A kind of full phase self-separating overvoltage protector of APB |
| US11641103B2 (en) * | 2020-11-06 | 2023-05-02 | Abb Schweiz Ag | Power semiconductor switch clamping circuit |
| CN116613720B (en) * | 2023-07-20 | 2023-09-29 | 江苏展芯半导体技术有限公司 | Surge protector |
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| CN1276641A (en) * | 1999-06-02 | 2000-12-13 | 尹顿公司 | Surge suppressing circuit capable of responding power disturbance change rate |
| CN2475206Y (en) * | 2001-04-06 | 2002-01-30 | 石进中 | Automatic cut-off type telephone protector for thunder and lightning |
| US6459559B1 (en) * | 1999-01-14 | 2002-10-01 | Dale Jack Christofersen | Thyristor controlled dynamic voltage suppressor for electric power systems |
| CN201075680Y (en) * | 2007-09-18 | 2008-06-18 | 中国电力科学研究院 | Apparatus for overvoltage protection |
| CN204290305U (en) * | 2014-12-22 | 2015-04-22 | 杜尧生 | Overvoltage protection device |
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|---|---|---|---|---|
| US6459559B1 (en) * | 1999-01-14 | 2002-10-01 | Dale Jack Christofersen | Thyristor controlled dynamic voltage suppressor for electric power systems |
| CN1276641A (en) * | 1999-06-02 | 2000-12-13 | 尹顿公司 | Surge suppressing circuit capable of responding power disturbance change rate |
| CN2475206Y (en) * | 2001-04-06 | 2002-01-30 | 石进中 | Automatic cut-off type telephone protector for thunder and lightning |
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| CN204290305U (en) * | 2014-12-22 | 2015-04-22 | 杜尧生 | Overvoltage protection device |
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